/*
 * Copyright (C) 2012-2016 Markus Junginger, greenrobot (http://greenrobot.org)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.greenrobot.eventbus;

final class Subscription {
  final Object subscriber;
  final SubscriberMethod subscriberMethod;
  /**
   * Becomes false as soon as {@link EventBus#unregister(Object)} is called, which is checked by
   * queued event delivery {@link EventBus#invokeSubscriber(PendingPost)} to prevent race
   * conditions.
   */
  volatile boolean active;

  Subscription(Object subscriber, SubscriberMethod subscriberMethod) {
    this.subscriber = subscriber;
    this.subscriberMethod = subscriberMethod;
    active = true;
  }

  @Override
  public boolean equals(Object other) {
    if (other instanceof Subscription) {
      Subscription otherSubscription = (Subscription) other;
      return subscriber == otherSubscription.subscriber
          && subscriberMethod.equals(otherSubscription.subscriberMethod);
    } else {
      return false;
    }
  }

  @Override
  public int hashCode() {
    return subscriber.hashCode() + subscriberMethod.methodString.hashCode();
  }
}
